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<script>
  // 将一个数组旋转K步
  const arr = [1,2,3,4,5,6,7]
  function fn(k) {
    for(let i = 0; i < k; i++) {
      let a = arr.pop()
      arr.unshift(a)
    }
    console.log(arr)
  }
  fn(3)
</script>
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